Wide character strings in the current locale.
The accessor functions are named
XXX_w().

UTF-8

Unicode strings encoded as UTF-8.
This are convience functions to update both the multibyte and wide
character strings at the same time.

The sourcepath is a pure filesystem concept and never stored in an
archive directly.

For that reason, it is only available as multibyte string.
The link path is a convience function for conditionally setting
hardlink or symlink destination.
It doesn't have a corresponding get accessor function.